John Lindley Leng

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Manchester, EN

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Patents Grantslast 30 patents

Information Patent Grant
Azo dyestuff including a 1,3 or 1,4-benzodioxan ring structure fuse...
- Patent number 4,002,604
- Issue date Jan 11, 1977
- Imperial Chemical Industries Limited
- David Melville Fawkes
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Dyestuffs
- Patent number 3,996,221
- Issue date Dec 7, 1976
- Imperial Chemical Industries Limited
- John Lindley Leng
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Monoazo hydroxy pyridone dyestuffs containing a methylene piperidin...
- Patent number 3,956,265
- Issue date May 11, 1976
- Imperial Chemical Industries Limited
- John Lindley Leng
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Indazole-azo phenyl compounds
- Patent number 3,935,183
- Issue date Jan 27, 1976
- Imperial Chemical Industries Limited
- Thomas Douglas Baron
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...